Catamarca vs San Nicolás de los Arroyos
Tree cover and air quality for both, measured the same way: Sentinel-2 imagery at 10 m detail over a 2 km radius from each city centre, and the live US EPA air quality index. Same radius and same index, so the two numbers compare directly.
San Nicolás de los Arroyos has more tree cover — 42.4% against 5.7%.
San Nicolás de los Arroyos has cleaner air right now — AQI 19 against 114.
- Tree cover gap
- 36.7 points
- San Nicolás de los Arroyos is ahead.
- Air quality gap
- 95 AQI
- San Nicolás de los Arroyos is cleaner.
- Trees between them
- 109K
- San Nicolás de los Arroyos has more standing.
Argentina
Argentina
Tree cover
Share of the 2 km radius under canopy.
5.7%
42.4%
Air quality index
US EPA index, live, with its band. Lower is better.
114 · Unhealthy for sensitive groups
19 · Good
Trees standing
Estimated from the measured canopy area.
17.9K
127K
Trees still needed
To reach the same canopy target. Fewer is better.
92.0K
0
CO₂ absorbed each year
By the trees already standing.
394K kg
2.8M kg
Air quality in detail
What each city is breathing
Concentrations in µg/m³, measured at the same moment as the index above. Lower is better in every row. Both are modelled, with no ground station close enough to either.
PM2.5
Fine particles, the pollutant that usually sets the index.
40.6 µg/m³
4.2 µg/m³
PM10
Coarser particles — dust, pollen, road grit.
42.4 µg/m³
4.5 µg/m³
Nitrogen dioxide
Mostly traffic and combustion.
7.1 µg/m³
4.2 µg/m³
Ozone
Forms in sunlight; peaks on hot, still afternoons.
107 µg/m³
42 µg/m³
The last week, day by day
A single reading can catch a city on a bad afternoon. The week says whether it was the weather or the place.
| Day | Catamarca | San Nicolás de los Arroyos |
|---|---|---|
| 22 Sept | 30 | 22 |
| 23 Sept | 28 | 21 |
| 24 Sept | 31 | 26 |
| 25 Sept | 35 | 30 |
| 26 Sept | 55 | 26 |
| 27 Sept | 83 | 25 |
| 28 Sept | 124 | 22 |
Reading these numbers
What is actually being measured
Tree cover
The share of ground under canopy inside a 2 km radius of each city centre, read from Sentinel-2 satellite imagery at 10 m detail. It is a measurement of that circle, not of the whole municipality — which is exactly what makes the two comparable, since city boundaries are drawn to wildly different rules around the world. San Nicolás de los Arroyos leads here at 42.4%.
Air quality index
The live US EPA index, computed from current pollutant concentrations — ground stations where a city has them nearby, and a model everywhere else. It moves hour to hour, so this is a snapshot rather than a verdict on either place: Catamarca reads 114 (unhealthy for sensitive groups) and San Nicolás de los Arroyos reads 19 (good) right now.
Frequently asked
Catamarca and San Nicolás de los Arroyos, answered
Which has more trees, Catamarca or San Nicolás de los Arroyos?
San Nicolás de los Arroyos, with roughly 126,677 trees inside its 2 km radius against 17,907. Tree cover tells a slightly different story from raw count: San Nicolás de los Arroyos has the denser canopy at 42.4%.
Which has better air quality, Catamarca or San Nicolás de los Arroyos?
San Nicolás de los Arroyos right now, at AQI 19 against 114 — a gap of 95 points. This is a live reading rather than an annual average, so it can reverse within a day.
How many more trees does each city need?
Catamarca needs about 92,049 more to reach its canopy target, and San Nicolás de los Arroyos about 0. The target is the same share of ground for both, so the figures are directly comparable.
Are these two measured the same way?
Yes — that is the point of the page. Identical radius, identical satellite source at 10 m detail, and the same US EPA index for air. Nothing here is adjusted for population, city limits or climate, so the numbers describe the same-sized circle of ground in each place.
Keep going
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